149 lines
3.7 KiB
Rust
149 lines
3.7 KiB
Rust
#[derive(Clone, Copy, PartialEq)]
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pub enum Cell {
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Empty,
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X,
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O,
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}
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impl std::fmt::Display for Cell {
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fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
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let s: &str;
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match *self {
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Cell::X => s = "X",
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Cell::O => s = "O",
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Cell::Empty => s = " ",
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}
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write!(f, "{}", s)
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}
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}
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pub struct Move {
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pub x: usize,
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pub y: usize,
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pub piece: Cell,
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}
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pub struct Board {
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cells: Vec<Cell>,
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next: Cell,
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}
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impl Board {
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pub fn new() -> Board {
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Board {
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cells: vec![Cell::Empty; 9],
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next: Cell::X,
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}
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}
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pub fn reset(&mut self) {
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self.cells = vec![Cell::Empty; 9];
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self.next = Cell::X;
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}
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pub fn apply(&mut self, m: Move) -> Result<(), &str> {
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if !self.is_valid_move(&m) {
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return Err("invalid move");
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}
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let i = m.x * 1 + m.y * 3;
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self.cells[i] = m.piece;
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match self.next {
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Cell::X => self.next = Cell::O,
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Cell::O => self.next = Cell::X,
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_ => {}
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}
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Ok(())
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}
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pub fn is_valid_move(&self, m: &Move) -> bool {
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let i = m.x * 1 + m.y * 3;
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m.piece == self.next && self.cells[i] == Cell::Empty
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}
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pub fn valid_moves_available(&self) -> bool {
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// check for draw condition
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for i in 0..self.cells.len() {
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if self.cells[i] == Cell::Empty {
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return true;
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}
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}
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return false;
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}
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pub fn has_winner(&self) -> Option<Cell> {
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// rows and cols
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for i in 0..3 {
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if (self.cells[i] != Cell::Empty)
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&& (self.cells[i] == self.cells[i + 3] && self.cells[i] == self.cells[i + 6])
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{
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return Some(self.cells[i]);
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} else if (self.cells[i * 3] != Cell::Empty)
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&& (self.cells[i * 3] == self.cells[i * 3 + 1]
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&& self.cells[i * 3] == self.cells[i * 3 + 2])
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{
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return Some(self.cells[i * 3]);
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}
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}
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// diagonals
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if (self.cells[0] != Cell::Empty)
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&& (self.cells[0] == self.cells[4] && self.cells[0] == self.cells[8])
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{
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return Some(self.cells[0]);
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}
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if (self.cells[2] != Cell::Empty)
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&& (self.cells[2] == self.cells[4] && self.cells[2] == self.cells[6])
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{
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return Some(self.cells[2]);
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}
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// no winner
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return None;
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}
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}
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impl std::fmt::Display for Board {
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fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
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let mut s = String::new();
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s.push_str(" 1 2 3 \n");
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s.push_str(" ┌───┬───┬───┐\n");
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for i in 0..3 {
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match i {
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0 => s.push_str("a "),
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1 => s.push_str("b "),
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2 => s.push_str("c "),
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_ => {}
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}
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s.push_str(&format!(
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"│ {} │ {} │ {} │\n",
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self.cells[i * 3],
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self.cells[i * 3 + 1],
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self.cells[i * 3 + 2]
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));
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if i < 2 {
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s.push_str(" ├───┼───┼───┤\n");
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}
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}
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s.push_str(" └───┴───┴───┘\n");
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match self.has_winner() {
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Some(w) => s.push_str(&format!("The winner is {w}")),
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None => match self.valid_moves_available() {
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true => s.push_str(&format!("Next: {}", self.next)),
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false => s.push_str("DRAW!"),
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},
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}
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write!(f, "{s}")
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}
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}
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